On 11/20/2013 08:18 AM, Stefan Roese wrote: > Hi! > > I'm currently working on a custom AM335x based board, where the SoC > RTC is disabled. As described in this page in the "RTC feature disabled" > column: > > http://processors.wiki.ti.com/index.php/AM335x_Schematic_Checklist#RTC > > On this board the registers of the RTC are not accessible. But the OMAP > hwmod code tries to read the sysc register unconditionally from the RTC. > And this leads to this crash (using v3.12): > > ... > [ 0.179491] CPU: Testing write buffer coherency: ok > [ 0.187702] Setting up static identity map for 0xc04dfa90 - 0xc04dfb00 > [ 0.204665] devtmpfs: initialized > [ 0.219513] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3 > [ 0.237462] *** _update_sysc_cache (263): name=emif > [ 0.246247] omap_hwmod: debugss: _wait_target_disable failed > [ 0.252290] *** _update_sysc_cache (263): name=uart1 > [ 0.257668] *** _update_sysc_cache (263): name=rtc > [ 0.262885] Unhandled fault: external abort on non-linefetch (0x1028) at 0xf9e3e078 > [ 0.270893] Internal error: : 1028 [#1] ARM > [ 0.275302] Modules linked in: > [ 0.278572] CPU: 0 PID: 1 Comm: swapper Not tainted 3.12.0-dirty #21 > [ 0.285222] task: c7047340 ti: c7048000 task.ti: c7048000 > [ 0.290909] PC is at _update_sysc_cache+0x44/0xb0 > [ 0.295861] LR is at _update_sysc_cache+0x1c/0xb0 > ... > > Disabling the RTC in the DT doesn't help (of course). So what's the > recommended way to disable this hwmod access to the RTC registers? http://www.spinics.net/lists/linux-omap/msg98207.html might help you - we had thought it might get queued for 3.12, but it was queued for 3.13 instead.. -- Regards, Nishanth Menon -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
